The Siemens 5SU9346-1CN32 is a SENTRON RCBO — an RCD-operated circuit breaker combining overcurrent and residual current protection in a single 4-pole unit. Rated 32 A at AC with a 30 mA residual trip and C-curve characteristic, it handles mixed lighting and small motor loads on a 50/60 Hz supply. The 6 kA breaking capacity per EN 60898 and IEC 60947-2 covers most commercial and light industrial panel faults.
What the ratings mean for fit
The 32 A rating is the continuous current at 30 °C; at 40 °C it derates to 29.8 A, at 45 °C to 28.5 A, and at 50 °C to 27.8 A — so a panel running warm needs a headroom check. The C-curve trips between 5 and 10 times rated current, suited for loads with moderate inrush like small compressors or pump starters. The 30 mA residual trip is the standard for personnel protection (shock hazard) per IEC 60364. Type AC means it detects sinusoidal AC fault currents only — not pulsed DC or smooth DC, so it's correct for circuits without VFDs or rectified loads.
Panel integration
Mounts in any position on DIN rail — 7 modular width units wide (126 mm), 77 mm deep, 90 mm tall. Installation depth is 70 mm. Supply can enter from top or bottom. The IP20 rating applies once installed in a distribution board with conductors connected, so it's an enclosed-panel part, not a standalone enclosure device. Touch protection is built in.